Office of Compensation Analysis and Support 

Program Evaluation Report

Document Number: OCAS-PER-011 

Effective Date: 9/26/2007 

Revision No. 0

K-25 TBD and TIB Revisions Page 1 of 2 

Author: Signature on file Date: 9/25/2007 Dave Allen, HP Team Leader 

Approval: Signature on file Date: 9/25/2007 J.W. Neton, Associate Director for Science 

Supersedes: None 

RECORD OF ISSUE/REVISIONS 

ISSUE 

AUTHORIZATION 

DATE 

9/26/2007

EFFECTIVE 

DATE 

9/26/2007 

REV. NO. 

0 

DESCRIPTION 

New document to determine which 

previously completed claims require a 

new dose reconstruction as a result of 

changes to the K-25 dose reconstruction 

methods. 

1.0 Description

On 11/24/2004 the external section of the Technical Basis Document (TBD) for the 

Oak Ridge Gaseous Diffusion Plant (K-25) was issued (ORAUT-TKBS-0009-6). This 

TBD contained a tabulation of the dose received by K-25 monitored workers that was to 

be used as co-worker dose for unmonitored workers. On 5/31/2005 ORAUT-OTIB0026 was issued which increased the external co-worker values to account for missed 

dose. Some of these values were decreased in Revision 00 Page Change 1 to this 

document issued 7/29/2005. This document was again revised with Page Change 2 on 

11/15/2006. This revision incorporated previsions of ORAUT-OTIB-0052 for 

unmonitored construction trades workers potentially exposed to radiation. These 

provisions however, were in place since ORAUT-OTIB-0052 was issued on 8/31/2006. 

Other revisions have been made to documents pertaining to K-25 but these revisions did 

not affect the dose reconstruction methodology. 

2.0 Issue Evaluation

The revisions to the external co-worker model would affect any claim completed before 

5/21/2005 that used this data. Since this data was not available until 11/24/2004, cases 

completed prior to that do not need to be evaluated. 

ORAUT-OTIB-0052 provides a method to estimate the external dose for construction 

trade workers who were unmonitored but likely exposed to greater than ambient radiation 

levels. The method is to multiply the external co-worker dose by 1.4. Therefore, the 
Office of Compensation Analysis and Support

Document Number: OCAS-PER-011 Program Evaluation Plan 

Effective Date: 9/26/2007 Revision No. 0 Page 2 of 2 

issuance of ORAUT-OTIB-0052 on 8/31/2006 has the potential to affect any construction 

trade worker claims completed with external co-worker data prior to the date of 

8/31/2006. Since this co-worker data was not available until 11/24/2004, cases 

completed prior to that would have been evaluated ambient levels of radiation or had 

dosimetry data and are therefore, not affected. 

3.0 Plan for Resolution or Corrective Action

There were 432 claims completed by NIOSH between 11/24/2004 and 8/31/2006 that 

resulted in a POC less than 50%. This does not include claims that may have been 

submitted in that time frame but subsequently returned to NIOSH for any reason. All 

these claims will be reviewed by NIOSH to determine if external co-worker data was 

used. NIOSH will request that DOL return those claims completed before 5/21/2005 

determined to have been completed using external co-worker data. NIOSH will also 

request the return of those claims completed with external co-worker data between 

5/21/2005 and 8/31/2006 if they are deemed a Construction Trades worker. DOL will be 

provided with documentation for the remaining claims indicating the claim did not meet 

these criteria.